I've managed to get into two matchmaking games so far and neither were particularly great. I'm not even kidding, one of them was 3v5 and the 5 was quite clearly a clan, it didn't do much for my K:D ratio.

MATCHMAKING
Addressed a number of issues that resulted in extended matchmaking times and low matchmaking success rates.
Made a number of updates to how matchmaking progress is communicated to the player. With this update, you’ll see better, more frequent and more informative status updates throughout the matchmaking flow – so “Players Found” for example, will be displayed to let players know where they are in the matchmaking process instead of simply wondering if it’s going to connect.
The improved matchmaking flow is as follows:
Searching
Searching for more players
Players found
Finalizing matchmaking process
Connecting session
Made an update to ensure that parties stick together when returning from the post-game carnage report
Prevented the ability for players “kick” other players from matchmaking games
Made an update to ensure that the Roster correctly displays the “searching” UI rather than “My Game Session” while searching for players
Removed the possibility to boost ranking through a custom games exploit
Made an update to ensure that players cannot get stuck in the matchmaking screen during map voting
Made an update to ensure that the “Connecting to your game” message no longer incorrectly displays in the lower right of the screen during gameplay
Made an update to the “team creation” phase that allows players to be grouped by team
Made an update to prevent players from seeing the “connection failed” dialogue if disconnected during the map voting screen
Improved roster / matchmaking lobby stability
Made improvements to the accuracy and stability of the “Game Session Details” UI
Improved version compatibility
UI
Improved emblem and nameplate behavior to ensure that they do not reset to default (especially after game sessions)
Corrected career stats that did not update uniformly across different profiles in multiple titles
Improved Forge map display names in Theater
Corrected various medal inconsistencies across titles
CAMPAIGN
Made updates to the attainability of various achievements, including “Goat Roped,” “Monopolized,” “You’re Joking,” and “Devastating.”
Improved Halo: CE career stat tracking
Resolved scoring and time HUD reset and display issues
Made an update to ensure that rival emblems are displayed correctly
HALO: CE
Improved consistency and reliability of shot registration
Improved headshot hitboxes
Fixed an issue where respawning players could momentarily appear at their death location
Made an update to ensure that the match ends when the entire opposing team quits
Improved fall damage consistency (specifically in regards to uneven surfaces)
Improved Halo: CE menu and loading screen stability
Improved consistency with multikill rewards
Made an update to improve post-game carnage report accuracy for Halo: CE FFA games
Updated default language settings
HALO 2
Made an update to ensure that the team color shown in pre-game lobby matches in-game
Improved a variety of networking issues to allow for improved consistency between host and clients in peer to peer matches
Improved a variety of networking issues to allow for improved gameplay consistency
Made an update to service tag functionality, allowing for service tags to appear for all players
Improved the post-game carnage report to correctly display team color
Made an update to ensure that the match ends when the entire opposing team quits
Improved “original” medal icon functionality in split-screen
Improved host migration functionality
Corrected “headshot” stat tracking
Addressed a crash that occurred with the Scarab skull
Addressed art errors that occurred on the opening cinematics for “Uprising” and “High Charity”
HALO 2: ANNIVERSARY
Made an update to prevent players from gaining achievements in Forge
Improved Forge item display names
Resolved text overlapping issues
Improved split screen stability
Made an update to resolve the notorious “-1th” scoreboard text
Improved lobby functionality to address players not being able to reconnect to the party leader after completing a match
Improved host migration functionality
Corrected vehicle and weapon thumbnails in the “Tools of destruction” table in the post-game carnage report
Addressed a dedicated server issue that caused gameplay physics issues on Stonetown
Improved split-screen party functionality to ensure that players are not directed to a broken lobby screen after completing a game session
Improved Forge mode stability
Made an update to King of the Hill scoring to prevent multiple hills from counting down at the same time
Improved Shrine objective spawn points
Improved King of the Hill and Ninjanaut mode stability
Addressed an issue where controller vibration could persist during the pause menu
Improved Race mode respawn zones
We have additional content updates on the way, and work is already underway in an effort to continue to improve your experience with Halo: The Master Chief Collection. We thank you for your continued patience and support.

Was super glad to see CE hit registration fixed. I know there is host advantage in it but I knew something felt especially wonky...

But it doesn't look like they've made much progress on mm. I'm not even going to complain, I just don't understand how 343 can't figure this stuff out. With this patch doing little to mm, I'm starting to worry that the population will be permanently stunted.

Was super glad to see CE hit registration fixed. I know there is host advantage in it but I knew something felt especially wonky...

But it doesn't look like they've made much progress on mm. I'm not even going to complain, I just don't understand how 343 can't figure this stuff out. With this patch doing little to mm, I'm starting to worry that the population will be permanently stunted.

Well, it's not like they could go to the company that owns Xbox Live and ask their engineers for help...

Shit, yes they could.

Well, I mean it's not like they could just call up Bungie and ask them for tips...

Shit, yes they could.

Well, I mean it's not like they're an older established team that's had a lot of time to work together...